Ensure MachineKey validation method - .Net 4.5 is configured

The machineKey element of the ASP.NET web.config specifies the algorithm and keys that ASP.NET will use for encryption. The Machine Key feature can be managed to specify hashing and encryption settings for application services such as view state, Forms authentication, membership and roles, and anonymous identification.

Machine key encryption can be set by using the UI, running appcmd.exe commands, by editing configuration files directly, or by writing WMI scripts. To set the Machine Key encryption at the global level using an appcmd.exe command.

%systemroot%\system32\inetsrv\appcmd set config /commit:WEBROOT /section:machineKey /validation:HMACSHA25